Rheem Heat Pump Breaker Keeps Tripping: Causes & Fixes
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Rheem heat pump breaker keeps tripping: what it means
“Breaker keeps tripping” is not a code shown on a Rheem display. It is a symptom: the circuit breaker feeding the outdoor unit or the indoor air handler shuts off power repeatedly. A breaker trips when it sees more current than it is rated for, or a short circuit.
This page covers circuit breakers at your electrical panel tripping. It does not cover a fault light on the unit, which is a separate page. If the outdoor unit simply stops while the breaker stays on, see the other Rheem heat pump pages instead.
How it behaves:
- A tripped breaker does not reset itself. It stays off until someone flips it back.
- When it trips matters for diagnosis:
- Immediately on reset usually means a dead short.
- At compressor start usually means a hard-start or locked-rotor condition.
- After running a while usually means overheating or a marginal component.
- Only in cold weather usually points to heat strips.
Because the most common causes are electrical failures inside the cabinet, this is professional work.
Rheem heat pump breaker keeps tripping: common causes, ranked by probability
- Failed or weak run capacitor (outdoor unit). A failing capacitor makes the compressor or fan motor draw excessive current at startup. This is the most common cause of trips that happen as the outdoor unit starts.
- Compressor electrical fault. A shorted or grounded compressor winding, or a locked rotor, draws very high current. A breaker that trips instantly at the outdoor unit and won’t hold often means a grounded compressor.
- Shorted or failing outdoor fan motor. A seized or shorted condenser fan motor can overload the circuit. It also causes high head pressure, which raises compressor current draw.
- Electric heat-strip fault (air handler breaker). A shorted heat-strip element, a failed sequencer or relay, or a damaged heat kit can trip the air-handler breaker. This usually happens in cold weather, when auxiliary or emergency heat comes on.
- Wiring problems.
- Loose, burned or corroded lugs at the contactor, disconnect or breaker
- Rodent-damaged wiring
- Water entering the disconnect box
- Failed contactor. Pitted or welded contacts can arc or cause erratic current draw.
- Undersized or worn breaker. The breaker may not match the maximum overcurrent protection rating on the Rheem data plate, or an aging breaker may trip below its rating.
- High-pressure operating conditions. A very dirty outdoor coil, airflow problems or a refrigerant issue raise compressor amps until the breaker trips. These conditions usually trip the unit’s internal protection first.
How to fix Rheem heat pump breaker keeps tripping: safe checks first
- Reset once only. Turn the thermostat to OFF. Then switch the breaker fully OFF and back ON. Wait 5 minutes, then restore heating or cooling. If it trips again, leave it off and call a professional.
- Note the details. Write down:
- Which breaker tripped (outdoor unit or air handler)
- When it tripped (instantly, at startup, after running, only on aux heat)
- Any buzzing, humming or burning smell
- Check the air filter. Replace a clogged filter. Restricted airflow raises system load, especially with heat strips running.
- Check thermostat settings. Avoid running Emergency Heat unnecessarily. Heat strips draw the most current in the system.
- Clear around the outdoor unit. Remove leaves, snow and debris from the outside of the unit, keeping 2 feet of clearance. Do not open the panels.
- Make sure exterior access panels are seated and that the disconnect box cover is closed.
- Stop immediately if you smell burning, see scorch marks or hear loud humming. Leave the breaker off and call a professional.
How a technician will diagnose it
A competent technician should do the following:
- Inspect the panel and disconnect for burned lugs or a heat-damaged breaker. Then confirm that the breaker size matches the data plate’s MCA and MOP ratings.
- Megohm or ohm test the compressor windings. This checks for a short to ground and for open or shorted windings between the common, start and run terminals.
- Test the capacitor with a capacitance meter against its µF rating.
- Measure amp draw on the compressor, fan motor and heat strips with a clamp meter, and compare against the rated RLA, FLA and LRA values.
- Test heat-strip elements and sequencers or relays in the air handler for shorts and proper staging.
- Inspect the contactor and all wiring for pitting, arcing or chafing.
- Check operating pressures and coil cleanliness if amp draw is high but the electrical parts test good.
Be cautious with these quotes:
- A compressor replacement quote that doesn’t include a documented ground or winding test.
- A whole-system replacement quote when only a capacitor or contactor has been tested as bad.
Symptom, cause and what to do
| Symptom | Likely cause | DIY action | Technician job |
|---|---|---|---|
| Outdoor breaker trips instantly on reset | Grounded compressor or wiring short | Leave breaker off | Megohm test compressor, inspect wiring |
| Trips as outdoor unit starts, with a hum | Failed capacitor or locked compressor | One reset only, then call | Test and replace capacitor, add hard-start kit |
| Trips after running 10 minutes or more | Fan motor failing, dirty coil, high pressure | Clear debris around unit, replace filter | Amp-draw test, motor replacement, coil cleaning |
| Air-handler breaker trips in cold weather | Shorted heat strip or sequencer | Avoid Emergency Heat, replace filter | Test elements and relays, replace heat kit parts |
| Burning smell or scorched breaker | Loose or burned lug, failing breaker | Leave off, call promptly | Repair terminations, replace breaker |
| Trips randomly, worse in rain | Moisture in disconnect or damaged wiring | Confirm disconnect cover is closed | Replace disconnect, repair wiring |
Rheem heat pump breaker keeps tripping repair cost
These are typical US installed prices. Costs vary by region and by model.
| Repair | Typical cost |
|---|---|
| Diagnostic visit | $90–$200 |
| Run capacitor replacement | $150–$400 |
| Hard-start kit | $200–$450 |
| Contactor replacement | $150–$400 |
| Wiring or lug repair, disconnect replacement | $150–$500 |
| Breaker replacement (electrician or HVAC) | $150–$350 |
| Outdoor fan motor replacement | $350–$800 |
| Heat-strip element or sequencer/relay | $200–$700 |
| Complete heat kit replacement | $400–$1,200 |
| Compressor replacement (labor and refrigerant even if parts are under warranty) | $1,500–$2,500 |
| Compressor replacement out of warranty | $2,000–$4,000 |
On older units, a grounded compressor out of warranty often makes replacing the whole system the better value.
Related codes
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- Rheem Heat Pump Auxiliary Heat On Constantly: Fixes
- Rheem Heat Pump Short Cycling: Causes, Fixes & Costs
- Rheem Heat Pump Not Heating: Causes, Fixes & Costs
- Rheem Heat Pump Not Cooling: Causes, Fixes & Costs
- Rheem Heat Pump Flashing Light: Causes & Fixes
Frequently asked questions
Can I keep resetting the breaker on my Rheem heat pump?
No. Reset it once. If it trips again, leave it off and call a licensed technician. A breaker that keeps tripping is protecting against a real fault, such as a shorted compressor or damaged wiring. Repeated resets can turn a repairable fault into a fire or a ruined compressor.
Which breaker is tripping, the outdoor unit or the air handler?
Most Rheem heat pump systems have two circuits: a double-pole breaker for the outdoor unit and a separate one, often larger, for the indoor air handler and its heat strips. Note which one trips and when. That information speeds up the diagnosis considerably.
Is a tripping breaker covered by Rheem's warranty?
Failed parts such as compressors, capacitors and heat-strip elements are often covered under Rheem's limited parts warranty if the unit was registered. Labor usually isn't covered unless you bought an extended labor plan. Have your model and serial number ready when you call.
Could the breaker itself be the problem?
Yes. Breakers wear out, especially older ones that have tripped many times, and an undersized breaker can also trip. An electrician or HVAC technician can test the breaker and compare its rating to the maximum overcurrent protection listed on the unit's data plate.